Brake



Dec. 3l, 1929. J; PAUL 1,741,875

BRAKE Filed Jan. 2l, 1928 3 Sheets-Sheet 2 Patented Dec. 3l, 1929 PATENT FFICE JULIUS PAUL, F DULUlyI-, MINNESOTA, ASSIGNOR OF FIFTY PER CENT TO RCHARD M. SELLVIOOD, OF DULUTH, MNNESOTA BRAKE Application filed January 2, 1928.' Seria] No. 248,453.

T his invention relates to shaft braking mechanisms and has special reference to that form of device known as hydraulic brakes, the preferred form of liquid used in this embodiment of the invention being oil.

The principal object sought is that of eiliciency, while other objects such as simplicity and durability are also accomplished.

Still other objects and advantages of the invention will appear in the further description thereof.

Referring now to the accompanying drawing forming part of this application and wherein like reference characters indicate like parts: y

Figure 1 is a vertical central section through one of the braking devices as installed upon a shaft such as for example the drive shaft of an automobile;

Figure 2 is an elevation of the brake drum head taken on the line 2 2, Figure 1, assuming the drum and head as being separated;

Figure 3 is an elevation of the back of the valve controlling rocker head; and

Figure l is an elevation of the pump rotor showing the arrangement of cylinders therein.

1 represents the shaft to which the brake mechanism is applied and which as before inferred may be the drive shaft of an automobile or otherwise as desired, Upon this shaft is mounted the non-rotatable main body portion 2 of the brake housing or drum, and also the drum head 3, they being united as by f suitable holding bolts 4 thereabouts and supported in any desiredmanner externally of the shaft; Within the drum and keyed to the shaft is mounted the pumpV roter 5, it being concentric with the shaft, while the brake drum is somewhat eccentric with the shaft for purposes hereinafter described.

Intermediate of the rotor 5 and the concavoconvex end of the drum 2 is mounted the valve controlling rocker head 6, and interme diate of it and the rotor is installed a suitable thrustbearing of any desired construction,

preferably comprising the two spaced disclike ball raceways 'I and 8, with balls 9 there- 24.1 carried by the rotor and the rocker head G. rlhis head is provided with the finger-like extension 11 upwardly therefrom which imn pinges the valve controlling plunger l2, and is also provided with transverse gudgeons 13,

one upon either side thereof, which are jour-` nalled in any desired manner within the opposite walls of the drum 2, so that the head is free to .rock upon said gudgeons in its manipulation of the plunger 12. rfhis plunger is reciprocably mounted within the upper interior wall of the drum 2, is reducedas 13 upon. the end opposite to 'that impinged by the finger 11, and about which reduced portion is an expansive helical spring 14 engaging the tapered valve 15, reciprocably mounted within the head 3 of the brake drum.

The valve 15 is for the control of the passageways 16, one upon either side thereof, and lead to the chambers upon the opposite sides of the division wall 17 in the head 3, said chambers being designated by the numerals 18 and 19 and being substantially semicircular in shape, they beingrecessed into the annular tapered extension 2O of the face of the head 3.

The major portion of the head 3 is hollow, forming a chamber 21 therein to provide a reservoir for oil and to which communication is established through suitable bali controlled check valves or ports indicated at 22, there being shown three of these communicating with each chamber 18`and 19, which permit oil passing from the chamber 21 into the chambers 18 and 19, as indicated in Figure 1 and in which view one of the valves and one of the ports 18 or 19y are shown directly beneath the shaft instead of to one side thereof. for better comprehension.

lVithin the rotor 5 are carried two series of reciprocable pistons, the larger ones being indicated at 23 and the smaller ones at 24;, they being of any relative size desired, but made as numerous as possible for accomplishing smooth and continuous action of the device. Each of these pistons are hollow, open upon their innermost ends and concaveV upon their outer closed end for engagement with the disc 8 of the thrust bearing. ithin the hollow a ioo spring 25 for the purpose of normally holding the pistons in their extreme extended position, the stationary end of each spring impinging against the bottom of the cylinder in which the piston is mounted. The bottom wall of each cylinder is provided with a suitable number of ports or holes 26 so that free communication at all time exists between the cylinders and either one or the other of the chambers 18 and 19 when thereover. As the shaft rotates carrying with it the runner 5, the pistons .will revolve the same, and if the rocker head 6 is in neutral position will impart no pumping action whatever inA respect to the transfer of oil. However upon motion of the rocker head towards vtheposition indicated in Figure 1 of the drawings the reciprocation of the pistons as they are carried about with the shaft will take place and while passing one of the chambers 18 or 19, depending upon the direction of rotation of the shaft, as is obvious will suck oil from one of the chambers and discharge into the other, and, provided the rocker head has not been thrust to its extreme innermost position as shown in by the plunger 12 any pressure of oil through the lpassageway 16 will tend' to slightly unseat same and permit of transfer of the oil through the passageway, the action of the valve being further delicately controlled by the spring 14 which may be of any desired tension, andV that a constant supply of oil is maintained in the chambers 18 and 19 through the check valves 22 from the chamber 21.

The control of the rocker head 6 maybe governed in any desired manner as for example a crank arm or lever fixed to one of the gudgeons 13 such lever being indicated at 27 and attached to any desired form of operating mechanism.

There is shown upon the opposite ends of the installation suitable ball bearings indicated at 28 and 29`to reduce to a minimum the friction upon the shaft 1.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is:

1. The combination with a shaft, of a housing thereupon, a pump runner within the housing and keyed to the shaft, a plurality of reciprocable pistons within the runner and parallel with the shaft, means for governing the reciprocation of the pistons during their revolutions with the shaft, an oil supply within the housing for the cylinders of the pistons, a selectively' controlled bypass intermediate JULIUS PAUL. 

